Grey Rock Shooter is little brother of Black Rock Shooter and Son of White Rock Shooter
Grey Rock Shooter is also named Kenta at times

Kenta is the last male on earth after the war that wiped out all of humanity in the year 2051 he resigns on the Moon with his Mother White Rock
Unlike his mother and older sister Grey Rock's flame is located on his left eye. He is quite easy to annoying but he is also very lonely.